The answer to 'natural carpenter ant repellent' is to use a combination of natural repellents and preventive measures to deter carpenter ants from infesting your home. Some effective natural repellents include essential oils like peppermint, lemongrass, or tea tree oil, as well as diatomaceous earth, boric acid, or vinegar.
To use these natural repellents, apply them around entry points, cracks, and crevices where you suspect carpenter ant activity. Reapply the repellents every few weeks or after heavy rain. Additionally, keep your home clean and dry, seal any cracks or gaps, and remove any rotting wood or moisture sources that could attract carpenter ants.